@article{MZ_1965__90_170493,
     author = {James E. Roseblade},
     title = {A note on subnormal coalition classes.},
     journal = {Mathematische Zeitschrift},
     pages = {373--375},
     publisher = {mathdoc},
     volume = {90},
     year = {1965},
     zbl = {0134.26101},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__90_170493/}
}